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-rw-r--r--crates/hir_ty/src/traits/chalk/mapping.rs575
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diff --git a/crates/hir_ty/src/traits/chalk/mapping.rs b/crates/hir_ty/src/traits/chalk/mapping.rs
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1//! This module contains the implementations of the `ToChalk` trait, which
2//! handles conversion between our data types and their corresponding types in
3//! Chalk (in both directions); plus some helper functions for more specialized
4//! conversions.
5
6use chalk_ir::{cast::Cast, fold::shift::Shift, interner::HasInterner, LifetimeData};
7use chalk_solve::rust_ir;
8
9use base_db::salsa::InternKey;
10use hir_def::{GenericDefId, TypeAliasId};
11
12use crate::{
13 db::HirDatabase,
14 primitive::UintTy,
15 traits::{Canonical, DomainGoal},
16 AliasTy, CallableDefId, FnPointer, GenericArg, InEnvironment, OpaqueTy, ProjectionTy,
17 QuantifiedWhereClause, Scalar, Substitution, TraitRef, Ty, TypeWalk, WhereClause,
18};
19
20use super::interner::*;
21use super::*;
22
23impl ToChalk for Ty {
24 type Chalk = chalk_ir::Ty<Interner>;
25 fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::Ty<Interner> {
26 match self.into_inner() {
27 TyKind::Ref(m, ty) => ref_to_chalk(db, m, ty),
28 TyKind::Array(ty) => array_to_chalk(db, ty),
29 TyKind::Function(FnPointer { sig, substs, .. }) => {
30 let substitution = chalk_ir::FnSubst(substs.to_chalk(db).shifted_in(&Interner));
31 chalk_ir::TyKind::Function(chalk_ir::FnPointer {
32 num_binders: 0,
33 sig,
34 substitution,
35 })
36 .intern(&Interner)
37 }
38 TyKind::AssociatedType(assoc_type_id, substs) => {
39 let substitution = substs.to_chalk(db);
40 chalk_ir::TyKind::AssociatedType(assoc_type_id, substitution).intern(&Interner)
41 }
42
43 TyKind::OpaqueType(id, substs) => {
44 let substitution = substs.to_chalk(db);
45 chalk_ir::TyKind::OpaqueType(id, substitution).intern(&Interner)
46 }
47
48 TyKind::ForeignType(id) => chalk_ir::TyKind::Foreign(id).intern(&Interner),
49
50 TyKind::Scalar(scalar) => chalk_ir::TyKind::Scalar(scalar).intern(&Interner),
51
52 TyKind::Tuple(cardinality, substs) => {
53 let substitution = substs.to_chalk(db);
54 chalk_ir::TyKind::Tuple(cardinality, substitution).intern(&Interner)
55 }
56 TyKind::Raw(mutability, ty) => {
57 let ty = ty.to_chalk(db);
58 chalk_ir::TyKind::Raw(mutability, ty).intern(&Interner)
59 }
60 TyKind::Slice(ty) => chalk_ir::TyKind::Slice(ty.to_chalk(db)).intern(&Interner),
61 TyKind::Str => chalk_ir::TyKind::Str.intern(&Interner),
62 TyKind::FnDef(id, substs) => {
63 let substitution = substs.to_chalk(db);
64 chalk_ir::TyKind::FnDef(id, substitution).intern(&Interner)
65 }
66 TyKind::Never => chalk_ir::TyKind::Never.intern(&Interner),
67
68 TyKind::Closure(closure_id, substs) => {
69 let substitution = substs.to_chalk(db);
70 chalk_ir::TyKind::Closure(closure_id, substitution).intern(&Interner)
71 }
72
73 TyKind::Adt(adt_id, substs) => {
74 let substitution = substs.to_chalk(db);
75 chalk_ir::TyKind::Adt(adt_id, substitution).intern(&Interner)
76 }
77 TyKind::Alias(AliasTy::Projection(proj_ty)) => {
78 let associated_ty_id = proj_ty.associated_ty_id;
79 let substitution = proj_ty.substitution.to_chalk(db);
80 chalk_ir::AliasTy::Projection(chalk_ir::ProjectionTy {
81 associated_ty_id,
82 substitution,
83 })
84 .cast(&Interner)
85 .intern(&Interner)
86 }
87 TyKind::Alias(AliasTy::Opaque(opaque_ty)) => {
88 let opaque_ty_id = opaque_ty.opaque_ty_id;
89 let substitution = opaque_ty.substitution.to_chalk(db);
90 chalk_ir::AliasTy::Opaque(chalk_ir::OpaqueTy { opaque_ty_id, substitution })
91 .cast(&Interner)
92 .intern(&Interner)
93 }
94 TyKind::Placeholder(idx) => idx.to_ty::<Interner>(&Interner),
95 TyKind::BoundVar(idx) => chalk_ir::TyKind::BoundVar(idx).intern(&Interner),
96 TyKind::InferenceVar(..) => panic!("uncanonicalized infer ty"),
97 TyKind::Dyn(dyn_ty) => {
98 let where_clauses = chalk_ir::QuantifiedWhereClauses::from_iter(
99 &Interner,
100 dyn_ty.bounds.value.interned().iter().cloned().map(|p| p.to_chalk(db)),
101 );
102 let bounded_ty = chalk_ir::DynTy {
103 bounds: make_binders(where_clauses, 1),
104 lifetime: LifetimeData::Static.intern(&Interner),
105 };
106 chalk_ir::TyKind::Dyn(bounded_ty).intern(&Interner)
107 }
108 TyKind::Unknown => chalk_ir::TyKind::Error.intern(&Interner),
109 }
110 }
111 fn from_chalk(db: &dyn HirDatabase, chalk: chalk_ir::Ty<Interner>) -> Self {
112 match chalk.data(&Interner).kind.clone() {
113 chalk_ir::TyKind::Error => TyKind::Unknown,
114 chalk_ir::TyKind::Array(ty, _size) => TyKind::Array(from_chalk(db, ty)),
115 chalk_ir::TyKind::Placeholder(idx) => TyKind::Placeholder(idx),
116 chalk_ir::TyKind::Alias(chalk_ir::AliasTy::Projection(proj)) => {
117 let associated_ty = proj.associated_ty_id;
118 let parameters = from_chalk(db, proj.substitution);
119 TyKind::Alias(AliasTy::Projection(ProjectionTy {
120 associated_ty_id: associated_ty,
121 substitution: parameters,
122 }))
123 }
124 chalk_ir::TyKind::Alias(chalk_ir::AliasTy::Opaque(opaque_ty)) => {
125 let opaque_ty_id = opaque_ty.opaque_ty_id;
126 let parameters = from_chalk(db, opaque_ty.substitution);
127 TyKind::Alias(AliasTy::Opaque(OpaqueTy { opaque_ty_id, substitution: parameters }))
128 }
129 chalk_ir::TyKind::Function(chalk_ir::FnPointer {
130 num_binders,
131 sig,
132 substitution,
133 ..
134 }) => {
135 assert_eq!(num_binders, 0);
136 let substs: Substitution = from_chalk(
137 db,
138 substitution.0.shifted_out(&Interner).expect("fn ptr should have no binders"),
139 );
140 TyKind::Function(FnPointer { num_args: (substs.len(&Interner) - 1), sig, substs })
141 }
142 chalk_ir::TyKind::BoundVar(idx) => TyKind::BoundVar(idx),
143 chalk_ir::TyKind::InferenceVar(_iv, _kind) => TyKind::Unknown,
144 chalk_ir::TyKind::Dyn(where_clauses) => {
145 assert_eq!(where_clauses.bounds.binders.len(&Interner), 1);
146 let bounds = where_clauses
147 .bounds
148 .skip_binders()
149 .iter(&Interner)
150 .map(|c| from_chalk(db, c.clone()));
151 TyKind::Dyn(crate::DynTy {
152 bounds: crate::Binders::new(
153 1,
154 crate::QuantifiedWhereClauses::from_iter(&Interner, bounds),
155 ),
156 })
157 }
158
159 chalk_ir::TyKind::Adt(adt_id, subst) => TyKind::Adt(adt_id, from_chalk(db, subst)),
160 chalk_ir::TyKind::AssociatedType(type_id, subst) => {
161 TyKind::AssociatedType(type_id, from_chalk(db, subst))
162 }
163
164 chalk_ir::TyKind::OpaqueType(opaque_type_id, subst) => {
165 TyKind::OpaqueType(opaque_type_id, from_chalk(db, subst))
166 }
167
168 chalk_ir::TyKind::Scalar(scalar) => TyKind::Scalar(scalar),
169 chalk_ir::TyKind::Tuple(cardinality, subst) => {
170 TyKind::Tuple(cardinality, from_chalk(db, subst))
171 }
172 chalk_ir::TyKind::Raw(mutability, ty) => TyKind::Raw(mutability, from_chalk(db, ty)),
173 chalk_ir::TyKind::Slice(ty) => TyKind::Slice(from_chalk(db, ty)),
174 chalk_ir::TyKind::Ref(mutability, _lifetime, ty) => {
175 TyKind::Ref(mutability, from_chalk(db, ty))
176 }
177 chalk_ir::TyKind::Str => TyKind::Str,
178 chalk_ir::TyKind::Never => TyKind::Never,
179
180 chalk_ir::TyKind::FnDef(fn_def_id, subst) => {
181 TyKind::FnDef(fn_def_id, from_chalk(db, subst))
182 }
183
184 chalk_ir::TyKind::Closure(id, subst) => TyKind::Closure(id, from_chalk(db, subst)),
185
186 chalk_ir::TyKind::Foreign(foreign_def_id) => TyKind::ForeignType(foreign_def_id),
187 chalk_ir::TyKind::Generator(_, _) => unimplemented!(), // FIXME
188 chalk_ir::TyKind::GeneratorWitness(_, _) => unimplemented!(), // FIXME
189 }
190 .intern(&Interner)
191 }
192}
193
194/// We currently don't model lifetimes, but Chalk does. So, we have to insert a
195/// fake lifetime here, because Chalks built-in logic may expect it to be there.
196fn ref_to_chalk(
197 db: &dyn HirDatabase,
198 mutability: chalk_ir::Mutability,
199 ty: Ty,
200) -> chalk_ir::Ty<Interner> {
201 let arg = ty.to_chalk(db);
202 let lifetime = LifetimeData::Static.intern(&Interner);
203 chalk_ir::TyKind::Ref(mutability, lifetime, arg).intern(&Interner)
204}
205
206/// We currently don't model constants, but Chalk does. So, we have to insert a
207/// fake constant here, because Chalks built-in logic may expect it to be there.
208fn array_to_chalk(db: &dyn HirDatabase, ty: Ty) -> chalk_ir::Ty<Interner> {
209 let arg = ty.to_chalk(db);
210 let usize_ty = chalk_ir::TyKind::Scalar(Scalar::Uint(UintTy::Usize)).intern(&Interner);
211 let const_ = chalk_ir::ConstData {
212 ty: usize_ty,
213 value: chalk_ir::ConstValue::Concrete(chalk_ir::ConcreteConst { interned: () }),
214 }
215 .intern(&Interner);
216 chalk_ir::TyKind::Array(arg, const_).intern(&Interner)
217}
218
219impl ToChalk for GenericArg {
220 type Chalk = chalk_ir::GenericArg<Interner>;
221
222 fn to_chalk(self, db: &dyn HirDatabase) -> Self::Chalk {
223 match self.interned {
224 crate::GenericArgData::Ty(ty) => ty.to_chalk(db).cast(&Interner),
225 }
226 }
227
228 fn from_chalk(db: &dyn HirDatabase, chalk: Self::Chalk) -> Self {
229 match chalk.interned() {
230 chalk_ir::GenericArgData::Ty(ty) => Ty::from_chalk(db, ty.clone()).cast(&Interner),
231 chalk_ir::GenericArgData::Lifetime(_) => unimplemented!(),
232 chalk_ir::GenericArgData::Const(_) => unimplemented!(),
233 }
234 }
235}
236
237impl ToChalk for Substitution {
238 type Chalk = chalk_ir::Substitution<Interner>;
239
240 fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::Substitution<Interner> {
241 chalk_ir::Substitution::from_iter(
242 &Interner,
243 self.iter(&Interner).map(|ty| ty.clone().to_chalk(db)),
244 )
245 }
246
247 fn from_chalk(
248 db: &dyn HirDatabase,
249 parameters: chalk_ir::Substitution<Interner>,
250 ) -> Substitution {
251 let tys = parameters.iter(&Interner).map(|p| from_chalk(db, p.clone())).collect();
252 Substitution(tys)
253 }
254}
255
256impl ToChalk for TraitRef {
257 type Chalk = chalk_ir::TraitRef<Interner>;
258
259 fn to_chalk(self: TraitRef, db: &dyn HirDatabase) -> chalk_ir::TraitRef<Interner> {
260 let trait_id = self.trait_id;
261 let substitution = self.substitution.to_chalk(db);
262 chalk_ir::TraitRef { trait_id, substitution }
263 }
264
265 fn from_chalk(db: &dyn HirDatabase, trait_ref: chalk_ir::TraitRef<Interner>) -> Self {
266 let trait_id = trait_ref.trait_id;
267 let substs = from_chalk(db, trait_ref.substitution);
268 TraitRef { trait_id, substitution: substs }
269 }
270}
271
272impl ToChalk for hir_def::TraitId {
273 type Chalk = TraitId;
274
275 fn to_chalk(self, _db: &dyn HirDatabase) -> TraitId {
276 chalk_ir::TraitId(self.as_intern_id())
277 }
278
279 fn from_chalk(_db: &dyn HirDatabase, trait_id: TraitId) -> hir_def::TraitId {
280 InternKey::from_intern_id(trait_id.0)
281 }
282}
283
284impl ToChalk for hir_def::ImplId {
285 type Chalk = ImplId;
286
287 fn to_chalk(self, _db: &dyn HirDatabase) -> ImplId {
288 chalk_ir::ImplId(self.as_intern_id())
289 }
290
291 fn from_chalk(_db: &dyn HirDatabase, impl_id: ImplId) -> hir_def::ImplId {
292 InternKey::from_intern_id(impl_id.0)
293 }
294}
295
296impl ToChalk for CallableDefId {
297 type Chalk = FnDefId;
298
299 fn to_chalk(self, db: &dyn HirDatabase) -> FnDefId {
300 db.intern_callable_def(self).into()
301 }
302
303 fn from_chalk(db: &dyn HirDatabase, fn_def_id: FnDefId) -> CallableDefId {
304 db.lookup_intern_callable_def(fn_def_id.into())
305 }
306}
307
308pub(crate) struct TypeAliasAsValue(pub(crate) TypeAliasId);
309
310impl ToChalk for TypeAliasAsValue {
311 type Chalk = AssociatedTyValueId;
312
313 fn to_chalk(self, _db: &dyn HirDatabase) -> AssociatedTyValueId {
314 rust_ir::AssociatedTyValueId(self.0.as_intern_id())
315 }
316
317 fn from_chalk(
318 _db: &dyn HirDatabase,
319 assoc_ty_value_id: AssociatedTyValueId,
320 ) -> TypeAliasAsValue {
321 TypeAliasAsValue(TypeAliasId::from_intern_id(assoc_ty_value_id.0))
322 }
323}
324
325impl ToChalk for WhereClause {
326 type Chalk = chalk_ir::WhereClause<Interner>;
327
328 fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::WhereClause<Interner> {
329 match self {
330 WhereClause::Implemented(trait_ref) => {
331 chalk_ir::WhereClause::Implemented(trait_ref.to_chalk(db))
332 }
333 WhereClause::AliasEq(alias_eq) => chalk_ir::WhereClause::AliasEq(alias_eq.to_chalk(db)),
334 }
335 }
336
337 fn from_chalk(
338 db: &dyn HirDatabase,
339 where_clause: chalk_ir::WhereClause<Interner>,
340 ) -> WhereClause {
341 match where_clause {
342 chalk_ir::WhereClause::Implemented(tr) => WhereClause::Implemented(from_chalk(db, tr)),
343 chalk_ir::WhereClause::AliasEq(alias_eq) => {
344 WhereClause::AliasEq(from_chalk(db, alias_eq))
345 }
346
347 chalk_ir::WhereClause::LifetimeOutlives(_) => {
348 // we shouldn't get these from Chalk
349 panic!("encountered LifetimeOutlives from Chalk")
350 }
351
352 chalk_ir::WhereClause::TypeOutlives(_) => {
353 // we shouldn't get these from Chalk
354 panic!("encountered TypeOutlives from Chalk")
355 }
356 }
357 }
358}
359
360impl ToChalk for ProjectionTy {
361 type Chalk = chalk_ir::ProjectionTy<Interner>;
362
363 fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::ProjectionTy<Interner> {
364 chalk_ir::ProjectionTy {
365 associated_ty_id: self.associated_ty_id,
366 substitution: self.substitution.to_chalk(db),
367 }
368 }
369
370 fn from_chalk(
371 db: &dyn HirDatabase,
372 projection_ty: chalk_ir::ProjectionTy<Interner>,
373 ) -> ProjectionTy {
374 ProjectionTy {
375 associated_ty_id: projection_ty.associated_ty_id,
376 substitution: from_chalk(db, projection_ty.substitution),
377 }
378 }
379}
380impl ToChalk for OpaqueTy {
381 type Chalk = chalk_ir::OpaqueTy<Interner>;
382
383 fn to_chalk(self, db: &dyn HirDatabase) -> Self::Chalk {
384 chalk_ir::OpaqueTy {
385 opaque_ty_id: self.opaque_ty_id,
386 substitution: self.substitution.to_chalk(db),
387 }
388 }
389
390 fn from_chalk(db: &dyn HirDatabase, chalk: Self::Chalk) -> Self {
391 OpaqueTy {
392 opaque_ty_id: chalk.opaque_ty_id,
393 substitution: from_chalk(db, chalk.substitution),
394 }
395 }
396}
397
398impl ToChalk for AliasTy {
399 type Chalk = chalk_ir::AliasTy<Interner>;
400
401 fn to_chalk(self, db: &dyn HirDatabase) -> Self::Chalk {
402 match self {
403 AliasTy::Projection(projection_ty) => {
404 chalk_ir::AliasTy::Projection(projection_ty.to_chalk(db))
405 }
406 AliasTy::Opaque(opaque_ty) => chalk_ir::AliasTy::Opaque(opaque_ty.to_chalk(db)),
407 }
408 }
409
410 fn from_chalk(db: &dyn HirDatabase, chalk: Self::Chalk) -> Self {
411 match chalk {
412 chalk_ir::AliasTy::Projection(projection_ty) => {
413 AliasTy::Projection(from_chalk(db, projection_ty))
414 }
415 chalk_ir::AliasTy::Opaque(opaque_ty) => AliasTy::Opaque(from_chalk(db, opaque_ty)),
416 }
417 }
418}
419
420impl ToChalk for AliasEq {
421 type Chalk = chalk_ir::AliasEq<Interner>;
422
423 fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::AliasEq<Interner> {
424 chalk_ir::AliasEq { alias: self.alias.to_chalk(db), ty: self.ty.to_chalk(db) }
425 }
426
427 fn from_chalk(db: &dyn HirDatabase, alias_eq: chalk_ir::AliasEq<Interner>) -> Self {
428 AliasEq { alias: from_chalk(db, alias_eq.alias), ty: from_chalk(db, alias_eq.ty) }
429 }
430}
431
432impl ToChalk for DomainGoal {
433 type Chalk = chalk_ir::DomainGoal<Interner>;
434
435 fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::DomainGoal<Interner> {
436 match self {
437 DomainGoal::Holds(WhereClause::Implemented(tr)) => tr.to_chalk(db).cast(&Interner),
438 DomainGoal::Holds(WhereClause::AliasEq(alias_eq)) => {
439 alias_eq.to_chalk(db).cast(&Interner)
440 }
441 }
442 }
443
444 fn from_chalk(_db: &dyn HirDatabase, _goal: chalk_ir::DomainGoal<Interner>) -> Self {
445 unimplemented!()
446 }
447}
448
449impl<T> ToChalk for Canonical<T>
450where
451 T: ToChalk,
452 T::Chalk: HasInterner<Interner = Interner>,
453{
454 type Chalk = chalk_ir::Canonical<T::Chalk>;
455
456 fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::Canonical<T::Chalk> {
457 let value = self.value.to_chalk(db);
458 chalk_ir::Canonical { value, binders: self.binders }
459 }
460
461 fn from_chalk(db: &dyn HirDatabase, canonical: chalk_ir::Canonical<T::Chalk>) -> Canonical<T> {
462 Canonical { binders: canonical.binders, value: from_chalk(db, canonical.value) }
463 }
464}
465
466impl<T: ToChalk> ToChalk for InEnvironment<T>
467where
468 T::Chalk: chalk_ir::interner::HasInterner<Interner = Interner>,
469{
470 type Chalk = chalk_ir::InEnvironment<T::Chalk>;
471
472 fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::InEnvironment<T::Chalk> {
473 chalk_ir::InEnvironment { environment: self.environment, goal: self.goal.to_chalk(db) }
474 }
475
476 fn from_chalk(
477 _db: &dyn HirDatabase,
478 _in_env: chalk_ir::InEnvironment<T::Chalk>,
479 ) -> InEnvironment<T> {
480 unimplemented!()
481 }
482}
483
484impl<T: ToChalk> ToChalk for crate::Binders<T>
485where
486 T::Chalk: chalk_ir::interner::HasInterner<Interner = Interner>,
487{
488 type Chalk = chalk_ir::Binders<T::Chalk>;
489
490 fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::Binders<T::Chalk> {
491 chalk_ir::Binders::new(
492 chalk_ir::VariableKinds::from_iter(
493 &Interner,
494 std::iter::repeat(chalk_ir::VariableKind::Ty(chalk_ir::TyVariableKind::General))
495 .take(self.num_binders),
496 ),
497 self.value.to_chalk(db),
498 )
499 }
500
501 fn from_chalk(db: &dyn HirDatabase, binders: chalk_ir::Binders<T::Chalk>) -> crate::Binders<T> {
502 let (v, b) = binders.into_value_and_skipped_binders();
503 crate::Binders::new(b.len(&Interner), from_chalk(db, v))
504 }
505}
506
507pub(super) fn make_binders<T>(value: T, num_vars: usize) -> chalk_ir::Binders<T>
508where
509 T: HasInterner<Interner = Interner>,
510{
511 chalk_ir::Binders::new(
512 chalk_ir::VariableKinds::from_iter(
513 &Interner,
514 std::iter::repeat(chalk_ir::VariableKind::Ty(chalk_ir::TyVariableKind::General))
515 .take(num_vars),
516 ),
517 value,
518 )
519}
520
521pub(super) fn convert_where_clauses(
522 db: &dyn HirDatabase,
523 def: GenericDefId,
524 substs: &Substitution,
525) -> Vec<chalk_ir::QuantifiedWhereClause<Interner>> {
526 let generic_predicates = db.generic_predicates(def);
527 let mut result = Vec::with_capacity(generic_predicates.len());
528 for pred in generic_predicates.iter() {
529 result.push(pred.clone().subst(substs).to_chalk(db));
530 }
531 result
532}
533
534pub(super) fn generic_predicate_to_inline_bound(
535 db: &dyn HirDatabase,
536 pred: &QuantifiedWhereClause,
537 self_ty: &Ty,
538) -> Option<chalk_ir::Binders<rust_ir::InlineBound<Interner>>> {
539 // An InlineBound is like a GenericPredicate, except the self type is left out.
540 // We don't have a special type for this, but Chalk does.
541 let self_ty_shifted_in = self_ty.clone().shift_bound_vars(DebruijnIndex::ONE);
542 match &pred.value {
543 WhereClause::Implemented(trait_ref) => {
544 if trait_ref.self_type_parameter() != &self_ty_shifted_in {
545 // we can only convert predicates back to type bounds if they
546 // have the expected self type
547 return None;
548 }
549 let args_no_self = trait_ref.substitution.interned(&Interner)[1..]
550 .iter()
551 .map(|ty| ty.clone().to_chalk(db).cast(&Interner))
552 .collect();
553 let trait_bound = rust_ir::TraitBound { trait_id: trait_ref.trait_id, args_no_self };
554 Some(make_binders(rust_ir::InlineBound::TraitBound(trait_bound), pred.num_binders))
555 }
556 WhereClause::AliasEq(AliasEq { alias: AliasTy::Projection(projection_ty), ty }) => {
557 if projection_ty.self_type_parameter() != &self_ty_shifted_in {
558 return None;
559 }
560 let trait_ = projection_ty.trait_(db);
561 let args_no_self = projection_ty.substitution.interned(&Interner)[1..]
562 .iter()
563 .map(|ty| ty.clone().to_chalk(db).cast(&Interner))
564 .collect();
565 let alias_eq_bound = rust_ir::AliasEqBound {
566 value: ty.clone().to_chalk(db),
567 trait_bound: rust_ir::TraitBound { trait_id: trait_.to_chalk(db), args_no_self },
568 associated_ty_id: projection_ty.associated_ty_id,
569 parameters: Vec::new(), // FIXME we don't support generic associated types yet
570 };
571 Some(make_binders(rust_ir::InlineBound::AliasEqBound(alias_eq_bound), pred.num_binders))
572 }
573 _ => None,
574 }
575}
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